Fungal infections in your toenails are caused by dermatophytes, yeasts, or molds, which can enter through a crack in the nail, a cut in the skin near it, or a separation between the nail and skin. Symptoms include discolored, thickened, brittle, crumbly, or misshapen nails.
Birth control propaganda wouldn't cut it, and the government sought a more forceful method of population control. In 1979 they introduced a policy that limiting some families to having only one child.
During the 1970s, Chinese citizens were encouraged to have only one child. The ongoing Cultural Revolution and the strain it placed on the nation were large factors.